CHEMICAL PROBLEMS

THERMODYNAMIC INVESTIGATION OF THE Ag7GeSe5I COMPOUND AND Ag8-xGeSe6-xIx SOLID SOLUTIONS BY THE EMF METHOD WITH SOLID ELECTROLYTE

Apr 8, 2026 •

Abstract Compounds of the argyrodite family and phases based on them are of considerable interest as environmentally friendly multifunctional materials exhibiting thermoelectric, photovoltaic, and optical properties, as well as high ionic conductivity. In this work, the thermodynamic properties of the Ag7GeSe5I compound and the solid solutions Ag8-xGeSe6-xIx were studied for the first time using the […]

ELECTROCHEMICAL AND SPECTROPHOTOMETRIC STUDY OF OLANZAPINE IN THE BUFFER SOLUTION AND THE EFFECT OF THE SOLVENT ON ITS COMPLEX FORMATION ABILITY

Mar 18, 2026 •

Abstract The electrochemical and spectrophotometric behavior of Olanzapine (OLZ) was studied for its optimal concentration ratio towards citrate buffer solution, the half-wave potential of a mercury dropping electrode, and electrochemical and spectrophotometric calibration curves for the qualitative and quantitative determination of OLZ. The influence of various solvents on the ability of OLZ to form complexes […]

EXTRACTIVE SPECTROPHOTOMETRIC DETERMINATION OF MICROAMOUNTS OF FE(III) IN WATER SAMPLES USING A NOVEL PYRAZOLIDINYL-BASED REAGENT

Mar 17, 2026 •

Abstract This article presents the study of the complexation behavior of (E)-3-(((1-methyl-3-oxo-2-phenyl- 5λ³-pyrazolidin-4-yl)diazenyl)methyl)pentane-2,4-dione (R1) with Fe(III) ions using the extractive spectrophotometric method. Different organic solvents were evaluated as extractants, among which 1- butanol provided the highest extraction efficiency. Optimal conditions for complex formation and extraction were established, revealing that Fe(III) predominantly exists as Fe(OH)₂⁺ under […]

SYNTHESIS AND CHARACTERIZATION OF Co+2, Ni+2, Cu+2 and Cd+2 COMPLEXES WITH (4-(TERT-BUTYL) BENZENETHIOL) ALKANE LIGANDS AND EVALUATION OF ITS BIOLOGICAL ACTIVITY

Mar 16, 2026 •

Abstract The research demonstrates that thioether-based coordination complexes obtain their physicochemical properties and biological activity from both the metal ion type and the ligand molecular structure. The synthesized complexes showed tetrahedral coordination geometries, as evidenced by spectroscopic, magnetic, and conductivity measurements, which demonstrated that sulfur atoms function as the main donor sites. The behavior follows […]

RESEARCH OF THE CHEMICAL COMPOSITION OF GRAPE OIL OBTAINED FROM THE EXTRACTION PROCESS WITH THE PARTICIPATION OF VARIOUS SOLVENTS

Feb 18, 2026 •

Abstract Efficient processing of rapidly increasing plant waste, environmental safety, and sustainable use of resources have become important areas in the chemical industry in modern times. Grape seeds are rich in highly unsaturated fatty acids and polyphenol compounds and are selected as a promising raw material for the production of environmentally friendly, plant-based grape seed […]